Hoist drum



F. Ev STAHL I-IOIS'I DRUM Dec. 18, 1934.

Filed Jan. 21, 1935 JIVVENTO/f' K E. 5 TAHL FRAN Patented Dec. 18, 1934HOIST DRUM Frank E. Stahl, Tonawanda, N. Y., assignor to ColumbusMcKinnon Chain Company, Tonawanda, N. Y., a corporation of New YorkApplication January 21, 1933, Serial No. 652,843

6 Claims.

My invention relates in general to improvements in hoist drums and moreparticularly to means for causing the second layer of cable to winduniformly upon the first layer.

It is well known to those skilled in the art 5 that in winding a secondlayer of cable upon a hoist drum, there is a tendency for the cable orwire rope to overlap and pile upon the last coil of the first layerand/or against the flange of the drum. This may continue for two orthree coils of the cable whereupon the additional coil or coils willslip off of the coil or coils underneath and move down to the level ofand in contact with the first layer of cable with resultant jarring ofthe load which the cable has been lifting.

The principal object of my invention has been to overcome thedisadvantages above pointed out and to provide means whereby the cableshall be started off on its second layer without an opportunity to pile.

Another object has been to gradually raise the last coil of rope aboutthe drum in such manner that it may be carried up to the level of thesecond layer whereupon it will be positively forced over into the grooveformed by the last two coils of the first layer.

Another object has been to provide a drum in which the point wherereeving of the second layer of rope starts shall be definitelydetermined, making it possible to place two drums on a single shaft andto so set such drums as to effect synchronous reeving.

Another object has been to provide means for fastening the inner end ofthe cable to a relatively small drum so as to prevent breaking of thecable, thereby increasing its life.

Furthermore, the above objects have been brought about in a manner whichdoes not add materially to the cost of an ordinary hoist drum.

The above objects and advantages have been accomplished by means of thedevice shown in the accompanying drawing, of which:

Fig. 1 is a front elevation of my complete drum, showing the cablecoiled about it and in crosssection.

- Fig. 2 is an end sectional view taken on line 2--2 of Fig. 1.

Fig. 3 is a similar section taken on line 33 of Fig. 1 and shows thefastening means for the inner end of the cable.

Fig. 4 is a fragmentary, transverse, sectional view taken on line 4-4 ofFig. 2.

5 is a similar view taken on line 55 of Fig. 6 is a similar view takenon line 6-6 of Fig. 7 is a similar view taken on line '7'1 of Fig. 2.

Fig. 8 is a fragmentary, transverse, sectional view of a drum providedwith guiding means at the opposite end, whereby a third layer of cablemay be properly reeved.

Fig. 9 is a side elevation showing my invention as applied to two drumscarried on a single shaft.

Referring to the drawing, 10 represents my 10 hoist drum which isprovided with a periphery having the customary helical groove 11 for thecable or wire rope 12. The bottom of this groove is, of course, concaveso as to fit the size of wire rope or cable 12 being used. The startingend 13 of the groove 11 terminates in a curved wall 14 which forms thebottom wall of a hole 15 through which the fixed end 16 of the cable 12passes into the interior of the drum. The curvature of the wall 14 meetsand joins the curvature of the drum periphery in a very smooth gradualmanner so that this end of the cable is not bent to such a degree thatit will be kinked or weakened by such bend. The extreme inner end of thecable is passed into the interior of the drum where it is provided withan anchor 17 which is fitted over and secured to the end of the cable bywell known means, whereby it will be securely fastened to the cable.When tension is placed upon the cable, the anchor will bear against theend face of the wall 14 which extends around the hole 15 and joins thebody 18 of the drum. The helical groove 11 extends across the peripheryof the drum from the starting end 13 at a pitch equal to substantiallythe diameter of the cable or wire rope 12. This helical groove isconcave as hereinbefore pointed out but starting at substantially thepoint 20 (see Fig. 2) in its last turn, the bottom of the groove isgradually filled in up to substantially the point 21 so as to bring thebottom of the groove up to the level of the top edge thereof. At thepoint 21, the surface is merged into and continues in a ridge 22. Asshown in Fig. 4 the last coil 23 of the cable is in the last turn of thegroove 11, but at a point which is slightly above the normal level ofthe previous turns. This view, therefore, shows the cable slightlyraised, and in Fig. 5 this layer of the cable is raised still higher andis carried upon the upper surface of the ridge 22. The ridge 22 is ofincreasing radius and thereby gradually raises the last coil of rope upto a point where it is substantially on a level with the top surface ofthe first layer of rope. This position is shown inclined toward the axisat the opposite end of the drum, such inclination increasing as theouter end of the ridge is reached, thus causing the last coil of therope to slide over in close contact with the last previous coil.

The drum is, of course, provided with end flanges 25 and 26. The flange25 is at thestarting end of the drum, and the flange 26 is at thefinishing end of the drum. Fig.1 shows the last coil of cable raised toa position Just preceding the position shown in .Fig. 6. Carried by theinner face of the flange 26 is a push-over cam 2'7. This cam is at itsmaximum lateral dimension at the apex 28 and gradually rises to thisapex over an inclined surface 29 which starts at point 30 which isslightly back of the point where the sectional view of Fig. 6 is taken.The apex 28 extends over and above the first layer of rope or cable andthe cam at its maximum lateral dimension is undercut, as shown at 31 inFig. 2, so as not to interfere with the winding of the last coil of thefirst layer of the wire rope. The apex 28 of this cam extends over thefirst layer at apoint about over its center line. It will be obviousthat as the rope extends from the drum, it will be gently pushed orurged over toward the groove formed between the first and second lastcoils of the first layer of the cable, thus insuringv its engagementwith this groove when the first coil of the second layer is wound uponthe drum.

Where the amount of cable handled is too great to be'woun'd upon thedrum in two layers, the drum may be formed with a ridge 35 and a cam 36at the starting end of the drum, as shown in Fig. 8. In this figure thedrum flange 3'7 is so located with respect to the first turn of thegroove 11 that a plane passing through the inner face of'the flange 37is interspaced with the first coil 39 of the first layer so as to allowthe last coil 38 of the second layer to move beyond the first coil 39 ofthe first layer. The ridge 35 will be gradually increased in diameter soas to cause the last coil 38 of the second layer on the drum to beraised up to the elevation of the third layer in a manner similar tothat at the starting of the second layer, the cam 36 being so positionedas to cause this last coil of the second layer when it is elevated to bepushed over between the first and second last coils of the second layerin a manner similar to that described in connection with the winding ofthe first coil of the second layer.

From theforegoing'it will be obvious that as the cable 12 approaches thelast convolution of the first layer in the groove 11, it is firstgradually raised to the top of the periphery of the drum and thenfurther gradually elevated by the ridge 22 until it is substantially atthe top of the previous coil of the first layer. As the drum continuesto rotate, the cam 27 will come in contact with the cable as it is beingreeved thereon and gently push it over into the groove formed by the twolast coils of the first layer, thus positively guiding the first coil ofthe second layer and preventing the possibility of its piling on top ofthe last coil of the first layer or between the first coil of the secondlayer and the flange of the drum.

In cases where two or more drums are used on a single shaft, as shown inFig. 9, my invention makes it possible to accurately set both drums sothat the second layer of rope or cable on each drum will start at thesame time it being well known that two drums have heretofore been used I1,ee 4,eo4 in Fig. 6. The upper surface of the ridge 22- is for handlingonly single layers of cable. This can be done because the point in therotation of each drum where the first coil of the second layer starts isaccurately determined by the push-over cm 2''.-

such coil being brought upto such starting point by the filled-inportion of the end of the groove 11 and by the ridge 22. This feature ofmy invention is of great value in a two-drum hoisting device, such asthat shown in Fig. 9. ,In this figure the lines 40 indicate thelowerinclined surface of a roof ofa box car or othersuitable supportingsurface to which the bearing brackets 41 are attached. These bracketsare, of course, permanently secured to the supporting surface and theycarryashaftiz. Oneoftheendsofthisshaft protrudes a considerable distancebeyond the end of one of the brackets and a hoist 43 is mountedthereupon. This hoist is preferably provided with an attaching ear 44which is permanently secured in an adjustable manner to a bracket 45,rigidly fixed to the supporting surface. This hoist is provided with theusual hand wheel 46 over which a handchain 47 (shown indot and dashlines) is passed. Carried by the shaft 42 and arranged preferably neareach of the bearing brackets 41 is a cable drum 48. As shown by thisfigure, the drums are so placed upon the shaft that the apex 28 of eachcam lies in substantially the same axial plane passing through theshaft, whereby when the cable 12 reaches the second layer, thesepushover cams will cause the second layers on both cams to be started atthe same instant.

- While I have shown my invention as applied to a drum having ahelically formed groove, it is obvious that my invention is applicablealso to drums having smooth peripheries. This and other modifications ofthe details herein shown and described may be made without departingfrom the spirit of my invention or the scope oi. the appended claims,and I do not, therefore, wish to be limited to the exact embodimentherein shown and described, the form shown being merely a preferredembodiment thereof.

Having thus described by invention, what I claim is:

1. As an article of manufacture, a hoisting drum having a rope receivingperiphery, a relatively long circumferential lifting ridge formed at thefinishing end of the drum, said ridge being formed with a graduallyincreasing radius for carrying the last convolution of the first layerof rope upon the drum up to substantially the top of such layer, and arelatively short push-over cam carried on the inner face of the endflange at the finishing end of the drum and located substantially wheresaid ridge is at its maximum radius, said cam extending above the lastconvolution of the preceding layer to a point over substantially the.center of such convolution.

2. As an article of manufacture, a hoisting drum having a rope receivingperiphery, a relatively long circumferential lifting ridge formed at thefinishing end of the drum, said ridge being formed with a graduallyincreasing radius for carrying the last convolution of the first layerof rope upon the drum up to substantially the top of such layer, and arelatively short push-over cam carried on the inner face of the endflange at the finishing end of the drum and located substantially wheresaid ridge is at its maximum radius, said cam being undercut andextending above the last convolution of the preceding layer to a pointover substantially the center of such convolution.

.3. As an article of manufacture, a hoisting drum having a helical, ropereceiving groove formed in its periphery, a relatively longcircumferential lifting ridge formed at the finishing end of the drum,said ridge being formed with a gradually increasing radius for carryingthe last convolution of the first layer of rope upon the drum up tosubstantially the top of such layer, the bottom of a portion of the lastconvolution of the groove being gradually brought up to the periphery ofthe drum Where it meets and joins the starting end of the ridge, and arelatively short push-over cam carried on the inner face of the endflange at the finishing end of the drum and located substantially wheresaid ridge is at its maximum radius, said cam extending above the lastconvolution of the preceding layer to a point over substantially thecenter of such convolution.

4. The combination with a shaft, of a plurality of drums rigidly mountedupon said shaft, each drum having a relative short push-over camoverhanging the periphery of the drum at the finishing end thereof, thepush-over cams of the drums being so located on the shaft that theirapices lie in the same plane, said plane being parallel to the axis ofthe shaft, whereby the drums may be synchronized so that the secondlayers of cable will be started on each drum at the same time.

5. The combination with a shaft, of a plurality of drums rigidly mountedupon said shaft, each drum having a relative short push-over camoverhanging the last turn of the groove in the periphery of the drum,the push-over cams of the drums being so located on the shaft that theirapices lie in the same plane, said plane being parallel to the axis ofthe shaft, whereby the drums may be synchronized so that the secondlayers of cable will be started on each drum at the same time 6. Thecombination with a shaft, of a plurality of drums rigidly mounted uponsaid shaft, each drum having a relatively long circumferential liftingridge formed at the finishing end of the drum, said ridge being formedwith a gradually increasing radius for carrying the last convolution ofthe first layer of rope upon the drum up to substantially the top ofsuch layer, and a relatively short push-over cam overhanging the lastturn of the groove in the periphery of the drum, the push-over cams ofthe drums being so located on the shaft that their apices lie in thesame plane, said plane being parallel to the axis of the shaft, wherebythe drums may be synchronized so that the second layers of cable will bestarted on each drum at the same time.

